Method of sealing vacuum-jackets.



, J. L. FATE: METHOD OF SEALING VACUUM JAGKE'I'S. I AIPLIOA'IION FILED MAYV3. 1909.

930,950.- I I 'PatnteaAu .10,19o9.

' Inventor: Wi'zzzegaar I ,g mzsAz-zome a:

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i To all whom it my concern:

area ora ion.

JOHN Ll'tMPSON FATE, OF CHICAGO, ILLINOIS, ASSIGNOR TO AMERICAN INSULATING COMPANY, A CORPORATION OF MAINE.

METHOD OF SEALING VACUUM-JACKETS.

Be it known that I, JOHN LAMPsoNFA'rE, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have'in'vented certain. new and useful Improvements 'in Methods of Sealing V acuum-Jacket s; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make. and use the same.

My invention has for its object to provide an effective method for exhausting and sealingvacuum jackets,

To this end, the novel process consists in exhausting the air from the jacket through av conduit containing afusible material, through which theair can be drawn by the exhaustingpum ,and then in fusing said material and al owing the same to solidify in said conduit while maintaining a vacuum on each side thereof. a

The accompanyingdrawings illiistrate a vacuum jacket which is to be sealed inaccox-dance with-this novel process or. method.

In said drawing, the numeral 1 represents .a hollow body or jacket adaptedto afford a vacuum chamber 2 when the air is exhausted therefrom. I v I The numeral 3 represents the exhausting and sealing conduit or nipple which is seated in one wall of the acket 1 and brazed air tight thereto.

The numeral 4 represents a. hose or pipe section connected with an. exhausting pump not. shown and provided with a stop cock or valve The hose 4 is adapted to be applied to the projecting end of the nipple -3 with an air tight joint. The nipple 3 is of such shape as to afi'ord a sealing trap 3 therein below the outer or projecting part of the nipple. The projecting part of the nipple is adapted to be loaded with particles of solder or other fusible material 6, through which the air can be drawn under the action of the pump The nipple is sufliciently contracted at or near the junction of the trap portion thereof with the projecting part of the nip plc to prevent the particles of 'fusible material (i from passing on down into the trap. This material is preferably in the form of shot-like pellets which will lodgeat the top Specificatiolf of Letters Patent.

Application filed'may 3, 1909.

Patented Aug. 10, 1909.

Serial No. 493,523.

of the trap, as shown by the full lines in the drawing. After the nipple has thus been loaded with the pellets of fusible material 6, the pump hose is applied to the projecting end of the nipple and the pump is kept in hausted from the chamber 2 of the jacket 1. Then the valve 5 in the pump pipe is turned into its closed position so as to maintain the material 6 within the sealing nipple 3. Then by a blow pipe or other suitable means, heat is applied to that portion of the nipple 3 containing the pellets of fusible material 6, and under the action thereof thismaterial will melt and flow down into the sealing trap 3 and there solidify and operate to seal the vacuum chamber. It is obvious that while the vacuum is maintained on both sides thereof and, for this reason, the sealing is effective; or otherwise stated, there is no chance for air to pass back from the atple 3 into the vacuum chamber 2 while the sealing is being done. After the fusible material has been fused and'the sealing com pleted as above described. the projecting end ready for use. 3y actual and extensive use ofthis process, I have demonstrated that with a good pump I can secure and seal a .ninety-eight per cent. of vacuum: and that the sealing so effected will be permanent;

at the solidified fusible material in the sealing nipple.

sealing nipple should be shaped to aiford should be so shaped that its projecting portion is adapted to be loaded-with the particles of fusible material, through which the air can be drawn, and that the shape of the nipple will cause. this material to lodge and to accumulate when fused so as to solidify and seal the passage in the nipple, and thereby hermetically seal the vacuum chamher. For example, the nipple may be of the shape disclosed in my pending applicavacuum on both sides of the pellets of. fusible- Inosphere through the pump, pipe 4 and nip-f It is not absolutely necessary that thea trap. All that is necessary is that it f tion S. N. 318,639, filed May 25, 1906, where action until all the air possible has been ex- .70 this scaling is done within the nipple 3 .80 of the nipple is cut off and the jacket is' or otherwise stated, if the vacuum is ever broken 1t wlll break at some other place than in this method was first disclosed by me and I material and allowing the same to solidify of which case this application is intended to in said conduit while maintaining a vacuum be a division. on each side thereof, substantially as de- VVhat I claim is: scribed. 5 The method of exhausting and sealing In testimony whereof Iafiix my signature vacuum'jackets which consists in exhausting in presence of two witnesses. the air from the jacket though a conduit JOHN LAMPSON FATE.

loaded with particles of fusible material v Witnessesz through which the air can be drawn-by the H. COHEN,

K. BUGN'ER 10 exhausting pump and then in fusing said 

